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Optical single sideband modulator

A single-sideband modulator, double-sideband technology, applied in optical demodulation, optics, instruments, etc., can solve the problems of information loss, good suppression, expensive and incapable

Inactive Publication Date: 2007-04-18
XIEON NETWORKS SARL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Such devices are expensive and cannot achieve good suppression of a sideband without attenuating the optical carrier
In addition, this device has the disadvantage that if the filters or lasers are out of tune, information may be lost

Method used

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  • Optical single sideband modulator
  • Optical single sideband modulator
  • Optical single sideband modulator

Examples

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Embodiment Construction

[0017] Figure 1 shows a single sideband modulator comprising optical am modulators such as Mach-Zehnder modulators MOD / 2,3( a mplitude m odulation, amplitude modulation) and ODSB-OSSB converter CON / 4, 5, 6 ( o ptical d double s ide b and- o ptical s ingle s ide b and, optical double sideband - optical single sideband).

[0018] A binary data signal DS is fed to a signal input 1 of a modulator device 2 which receives a CW (constant wavelength) signal from a laser 3 and outputs an optical amplitude modulated double sideband signal DSBS. This signal is combined in a coupler or filter (wavelength multiplexer) 4 with the pump signal PS generated by the pump source 5 and is passed to the signal input of a semiconductor optical amplifier (SOA) 6 that performs ODSB-OSSB conversion . The pump signal PS is used to keep the SOA in the saturation region.

[0019] The transfer function of SOA can be approximately described by the following formula:

[0020] ...

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Abstract

The optical single sideband modulator includes an amplitude modulator (MOD) and a converter (CON) comprising a semiconductor optical amplifier (6), using the chirp effect to convert an amplitude modulated optical signal (DSBS) into a single sideband signal (SSBS) without a filter for eliminating one of the sidebands.

Description

technical field [0001] The invention relates to an optical single sideband modulator. Background technique [0002] In optical communication, optical single sideband modulation OSSB has three important advantages compared with double sideband modulation: [0003] - The most significant advantage of the OSSB system is that the spectrum occupancy is reduced and thus the number of transmission channels in the wavelength multiplexed signal is increased compared to conventional systems. [0004] - The OSSB system has a higher tolerance to the dispersion introduced by the transmission fiber. [0005] - The OSSB system allows electrical compensation and electrical pre-compensation. [0006] The most common generation of OSSB signals is performed by optical modulators that generate double sideband signals. The double sideband modulated signal is fed to an optical filter to suppress one sideband. [0007] Such devices are expensive and cannot achieve good suppression of a sideban...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/14G02F2/02H04B10/18H04B10/50H04B10/516
CPCH04B10/5165H04B10/505H04B10/516H04B2210/517
Inventor P·蒙特罗T·西尔弗拉A·泰希拉
Owner XIEON NETWORKS SARL
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